Coherent Fiber Bundle Display Layout for Bright AR Waveguides
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Solution Overview
Problem
Existing display technologies for augmented and virtual reality head-mounted displays require high electrical power to achieve high brightness, leading to complex thermal and electromagnetic interference management, which increases weight and size, and fail to efficiently couple a bright image source with a waveguide.
Innovation Solution
The use of a coherent fiber bundle (CFB) to remotely locate the image source from the waveguide and collimating optics, allowing efficient heat and electromagnetic interference management, and coupling a bright image source to a waveguide through a CFB to achieve high luminance displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high electrical power is used to drive the display and light engine to achieve high brightness, then the brightness is improved, but the thermal management complexity and weight increase
Solution Approach 1:
The patent extracts the light engine from the display package and relocates it to a remote position. A coherent fiber bundle is used to transmit light from the remotely located light engine to the display waveguide, thereby removing the heavy thermal management components from the display package while maintaining high brightness output.
Solution Approach 2:
The coherent fiber bundle acts as an intermediary medium to transmit light energy from the remotely located light engine to the display waveguide. This allows the light engine to be physically separated from the display package, eliminating the need for complex thermal management within the display package while preserving the high brightness function.
2Illumination intensity
If high electrical power is used to achieve high brightness, then the brightness is improved, but the thermal management complexity increases
Solution Approach 1:
The light engine is extracted from the display package and relocated to a remote position where thermal management can be handled separately. This extraction eliminates the need for complex thermal management systems within the display package itself, while the display package maintains its high brightness function through the remotely located light engine.
3Temperature
If the image source is located remotely from the waveguide, then the thermal signature is reduced, but the coupling efficiency must be maintained
Solution Approach 1:
The coherent fiber bundle serves as an intermediary that efficiently couples light from the remotely located light engine to the display waveguide. The fiber bundle maintains spatial coherence and optical alignment, ensuring high coupling efficiency despite the physical separation between the light engine and waveguide, thereby reducing the thermal signature of the display package.
4Weight of moving object
If a coherent fiber bundle is used to remotely locate the image source, then the weight distribution is improved, but the device complexity increases
Solution Approach 1:
The light engine is extracted from the display package and relocated to a remote position, improving weight distribution by separating heavy components from the display package. The coherent fiber bundle provides a compact and efficient light transmission path, minimizing the added complexity while enabling the remote configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in a smaller, lighter, and cooler display package with reduced thermal and electromagnetic signatures, enabling high luminance displays with improved weight distribution and efficient heat dissipation.
Implementation Method 1
a coherent fiber bundle (CFB) that is positioned between and coupled to (i) the waveguide and the collimating optics and (ii) the image source and the collimating optics module
Data Source
AI summary
A display apparatus is provided. The display apparatus includes a waveguide and a collimating optics that are positioned at a first side of the display apparatus and coupled to each other. The display apparatus includes an image source and a collimating optics module arranged at a second side of the display apparatus. The second side of the display apparatus is different from the first side of the display apparatus. The display apparatus includes a coherent fiber bundle (CFB) that is positioned between and coupled to (i) the waveguide and the collimating optics and (ii) the image source and the collimating optics module.